Q: How to change my id

Create a new apple ID: Create an Apple ID - Apple - My Apple ID

Keep in mind no purchases made with your current Apple ID will be transferable to the new.

https://appleid.apple.com/cgi-bin/WebObjects/MyAppleId.woa/

Manage your APple ID

Be careful, if you create a new Apple ID instead of changing the existing one, anything you have purchased with the current ID is always associated to that ID and can never be transferred to a different ID.

It is best to change either your ID email or password on a current Apple ID, like if your email provider has changed.

echoing Robdrage - nothing good comes from firing up a new ID.  If there is a problem with the old ID - you are better off trying to fix that.

Apple ID: Changing your Apple ID

http://support.apple.com/kb/ht5621

Using your Apple ID for Apple services

http://support.apple.com/kb/HT4895

Apple ID: What to do after you change your Apple ID

http://support.apple.com/kb/HT5796?viewlocale=en_US&locale=en_US

iTunes Store: Associating a device or computer to your Apple ID

http://support.apple.com/kb/ht4627

iOS: Changing the signed-in iTunes Store Apple ID Account

http://support.apple.com/kb/ht1311

 Cheers, Tom